Only off when mad dogs go out? (4)
I believe the answer is:
noon
'when mad dogs go out?' is the definition.
('mad dogs and go out in the midday sun')
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for noon that I've seen before include "[LUNCHTIME] ?" , "Twelve during daylight" , "See 8" , "12 o'clock" , "when only mad dogs go out?" .)